Practice Questions

TLS Online TPP Program

#Question id: 11553

Tadpoles must undergo a major metamorphosis to become frogs. This change includes reabsorption of the tail, growth of limbs, calcification of the skeleton, increase in rhodopsin in the eye, development of lungs, change in hemoglobin structure, and reformation of the gut from the long gut of an herbivore to the short gut of a carnivore. Amazingly, all of these changes are induced by thyroxine. What is the most likely explanation for such a wide array of effects of thyroxine?

#Biochemistry

There are many different forms of thyroxine, each specific to a different tissue.
Different tissues have thyroxine receptors that activate different signal transduction pathways.
Some tissues have membrane receptors for thyroxine, while other tissues have thyroxine receptors within the nucleus.
Different releasing hormones release thyroxine to different tissues.

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TLS Online TPP Program

#Question id: 13037

#Environmental Science

Which of the following proteins will be most far away from the positively charged electrode during isoelectric focusing in a buffer with pH of 5?

TLS Online TPP Program

#Question id: 13052

#Biochemistry

What would be the effect on the PCR reaction if any of the following circumstances arose: 1) there are no primers in the reaction, 2) there are no dNTPs in the reaction, 3) there is no Taq polymerase in the reaction?

TLS Online TPP Program

#Question id: 13052

#Zoology

What would be the effect on the PCR reaction if any of the following circumstances arose: 1) there are no primers in the reaction, 2) there are no dNTPs in the reaction, 3) there is no Taq polymerase in the reaction?

TLS Online TPP Program

#Question id: 13052

#Life Sciences

What would be the effect on the PCR reaction if any of the following circumstances arose: 1) there are no primers in the reaction, 2) there are no dNTPs in the reaction, 3) there is no Taq polymerase in the reaction?

TLS Online TPP Program

#Question id: 13052

#Applied Microbiology

What would be the effect on the PCR reaction if any of the following circumstances arose: 1) there are no primers in the reaction, 2) there are no dNTPs in the reaction, 3) there is no Taq polymerase in the reaction?

TLS Online TPP Program

#Question id: 13052

#Bio-Informatics

What would be the effect on the PCR reaction if any of the following circumstances arose: 1) there are no primers in the reaction, 2) there are no dNTPs in the reaction, 3) there is no Taq polymerase in the reaction?